CN102943164A - High yield-strength ratio SPCC (steel plate cold commercial) thin steel plate cold rolling and continuous annealing process method - Google Patents
High yield-strength ratio SPCC (steel plate cold commercial) thin steel plate cold rolling and continuous annealing process method Download PDFInfo
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Abstract
The invention relates to a high yield-strength ratio SPCC (steel plate cold commercial) thin steel plate cold rolling and continuous annealing process method which belongs to the technical field of metal material processing and metal heat treatment. The technical scheme is that the thickness of a hot-rolled SPHC (steel plate hot-rolled commercial) steel plate is reduced from 2.5-3.0 mm to 0.15-0.2 mm through second cold rolling, and the cold rolling reduction rate is kept to change within 75%-90%; and the thin cold-rolled steel plate is continuously annealed by a continuous annealing furnace. The process parameters of continuous annealing include that the heating temperature of the thin steel plate is 580-620 DEG C, the heating rate is kept within 10-15 DEG C, the holding time at the soaking section is 30-80 seconds, and the cooling rate is kept with 15-40 DGE C per second. The final average grain size of the continuously annealed thin steel plate is within 5.0-6.8mum, and the SPCC thin steel plate is leveled at a constant extension rate of 0.5%-1.5% to obtain the yield-strength ratio of 0.94-0.98. The SPCC thin steel plate prepared by the process method provided by the invention has the advantages that the average grain size is 5.0-6.8mum and the yield-strength ratio is 0.94-0.98. Compared with the background art, the SPCC thin steel plate prepared by the process method provided by the invention has the advantages of finer and evener microstructure state and higher yield-strength ratio.
Description
Technical field
The present invention relates to the cold rolling and continuous annealing process method of a kind of high-yield-ratio SPCC steel sheet, belong to metal material processing and metal heat treatmet technical field.
Background technology
SPCC represents general with cold rolling carbon steel thin plate and steel band, is mainly used in the fields such as automobile making, electric product, rolling stock, aerospace, precision meter.In recent years, in the automobile component field, the cheap price that the SPCC steel plate has, good plastic deformation ability and certain anti-impact are pressed performance, constantly win the concern of car manufactures, product consumption increasing year by year; In the food product pack field, some and food non-direct-contact do assorted tank product, such as caddy, cracker box, cigarette case etc., all adopt the SPCC steel plate as tinning substrate, make the packaging steel.For the SPCC product, the good mechanical property of SPCC thin plate must annealed art breading just can obtain.According to the difference of anneal mode, the annealing process of SPCC steel plate is divided into two kinds of bell-type annealing and continuous annealings.At present, other SPCC steel plate of the soft level of background technology adopts the bell-type annealing art breading more; Comparatively speaking, other SPCC steel sheet of high rigidity level must be processed through continuous annealing process.Yet, in the actual production process, because cold-rolling process parameter and heat treatment process parameter control are improper, the high rigidity rank SPCC steel sheet that continuous annealing is processed can present the problem of the thick and skewness of grain-size, after smooth processing, the yield strength index often occurs and descend, cause SPCC steel-sheet yield tensile ratio on the low side, have a strong impact on product performance index and work-ing life.Existing document about bell-type annealing technique raising SPCC steel sheet yield tensile ratio is pointed out (Qi Jianqun, the process optimization of cold-reduced sheet SPCC and performance analysis, the metal world, 2008,4,34-41; Gao Rongqing, Wu Gengliang, Sun Jianwei, draft and annealing temperature are on the impact of SPCC cold-rolled steel strip tissue and performance, metal heat treatmet, 2011,36 (7), 23-27): rationally controlling draft or the parameter and annealing of SPCC cold-reduced sheet, is the key factor that improves SPCC steel plate yield tensile ratio.But, do not provide and how to control cold rolling draft and continuous annealing process parameter, improve the concrete technical scheme of high rigidity rank SPCC steel sheet yield tensile ratio.
Summary of the invention
The object of the invention provides the cold rolling and continuous annealing process method of a kind of high-yield-ratio SPCC steel sheet, the cold rolling draft of SPCC steel-sheet is combined with continuous annealing process, take full advantage of the technical characterstic that cold rolling aximal deformation value promotes the refinement of continuous annealing recrystal grain, rationally control cold rolling draft, and strictly control the continuous annealing process parameter, acquisition crystal grain is tiny after guaranteeing annealing, the uniform recrystallize microstructure of grain size distribution, after smooth processing, the final good mechanical property that obtains high-yield-ratio solves the problems referred to above that exist in the background technology.
Technical scheme of the present invention is: the cold rolling and continuous annealing process method of a kind of high-yield-ratio SPCC steel sheet comprises following steps:
1. with the SPHC hot-rolled coil, be rolled into the steel plate that thickness is 0.6 ~ 2.0mm at the Straight pull reversable cold-rolling machine, carry out anneal by bell type annealing furnace, thermal treatment temp is 600 ~ 650
oC, heat treatment time are 5 ~ 30min; Steel plate after the anneal carries out secondary cold-rolling, and the reduced thickness to 0.15 of steel plate ~ 0.2mm is called steel sheet, and cold rolling draft is 75 ~ 90%;
2. steel sheet is sent into continuous annealing furnace, carry out continuous annealing and process; In the heating zone of continuous annealing furnace, steel sheet is heated to 580 ~ 620 by room temperature
oC, temperature rise rate maintains 10 ~ 15
oC/s; Then, steel sheet enters the soaking zone of continuous annealing furnace and does the insulation processing, and soaking time is 30 ~ 80s; After leaving soaking zone, enter the cooling section of continuous annealing furnace with steel, the nitrogen that carries by continuous annealing furnace-hydrogen combination cooling atmosphere makes steel plate be quickly cooled to 500 ~ 550
oC, rate of cooling maintains 15 ~ 40
oC/s;
3. the steel sheet after continuous annealing being processed carries out the smooth processing of permanent unit elongation mode; Smooth unit elongation is 0.5 ~ 1.5%, and through smooth processing, final SPCC steel-sheet average grain size is distributed in 5.0 ~ 6.8 μ m scopes, and yield tensile ratio maintains between 0.94 ~ 0.98.
The thickness of described SPHC hot-rolled coil is 2.5--3.0mm, is rolled into the steel plate that thickness is 0.6 ~ 2.0mm at the Straight pull reversable cold-rolling machine, carries out anneal by bell type annealing furnace, and thermal treatment temp is 600 ~ 650
oC, heat treatment time are 5 ~ 30min; Steel plate after the anneal carries out secondary cold-rolling, the reduced thickness to 0.15 of steel plate ~ 0.2mm.
Technical characterstic of the present invention:
Step 1. in SPHC hot rolled coil attenuate at twice, in order to guarantee that the secondary cold-rolling process has higher cold rolling draft on the one hand, play the purpose of destroying bell-type annealing steel plate recrystallization grain structure, reduce the size of deformed grains on thickness direction of rolling structure, so that it is tiny to obtain crystal grain after the continuous annealing, the recrystallized structure of even size distribution; On the other hand, the operation of rolling is carried out at twice, processes the loss of roll in the time of can reducing reroll by the bell-type annealing of pilot process.
Step is middle continuous annealing temperature, soaking zone soaking time, cooling section temperature and the rate of cooling of setting 2., all are optimal processing parameters of determining through lot of experiments, can guarantee that steel sheet behind the secondary cold-rolling obtains finally that crystal grain is tiny, the microstructure state of the perfect recrystallization of size uniform.Wherein, the control Heating temperature mainly enters the perfect recrystallization temperature province for cold rolling microstructure, guarantee that the tissue after the continuous annealing has the perfect recrystallization structural state, simultaneously, temperature rise rate can prevent that recrystal grain from burst occuring grow up comparatively slowly, guarantees the homogeneity of recrystallized structure grain-size.At soaking zone insulation certain hour, mainly be energy and the time that abundance is provided for the recrystallization process of cold rolling microstructure, guarantee whole cold rolling microstructures realization perfect recrystallizations.At last, the rate of cooling of control cooling section is to prevent that recrystallize from continuing to grow up in process of cooling, guarantees that recrystallized structure has tiny crystal grain.
The smooth unit elongation that step is determined in 3. mainly is the yield point elongation that produces after the anneal in order to eliminate, and improves SPCC steel sheet resistance to deformation, prevents from occuring in the use procedure uniform plastic deformation.Above-mentioned technical superiority can guarantee that the SPCC steel sheet of final preparation has that crystal grain is tiny, the microstructure characteristics of even size distribution, and then realizes higher yield tensile ratio index.
Beneficial effect of the present invention is: the SPCC steel sheet that the present invention is prepared, its average grain size scope are 5.0 ~ 6.8 μ m, and its yield tensile ratio index is 0.94 ~ 0.98.The SPCC steel sheet of the present invention's preparation and the like product of background technology relatively have more tiny, uniform microstructure state and more outstanding yield tensile ratio index.
Description of drawings
The SPCC steel sheet metallographic structure of Fig. 1, embodiment 1 preparation;
The SPCC steel sheet metallographic structure of Fig. 2, embodiment 2 preparations;
The SPCC steel sheet metallographic structure of Fig. 3, embodiment 3 preparations;
The SPCC steel sheet grain size distribution situation of Fig. 4, embodiment 1 preparation;
The SPCC steel sheet grain size distribution situation of Fig. 5, embodiment 2 preparations;
The SPCC steel sheet grain size distribution situation of Fig. 6, embodiment 3 preparations;
The SPCC steel sheet mechanical stretch curve of Fig. 7, the present invention's preparation; Among the figure: (a) embodiment 1 curve; (b) embodiment 2 curves; (c) embodiment 3 curves.
Embodiment
The present invention will be further described by the following examples.
Embodiments of the invention, take the hot rolling SPHC steel plate of 2.5--3.0mm thickness as target, the thickness of SPHC hot-rolled coil is 3.0mm, is rolled into the steel plate that thickness is 0.6 ~ 2.0mm at the Straight pull reversable cold-rolling machine, carry out anneal by bell type annealing furnace, thermal treatment temp is 600 ~ 650
oC, heat treatment time are 5 ~ 30min; Steel plate after the anneal carries out secondary cold-rolling, and the reduced thickness to 0.15 of steel plate ~ 0.2mm is called steel sheet, and cold rolling draft is 75 ~ 90%; Afterwards, the recycling continuous annealing furnace carries out continuous annealing to steel sheet to be processed, and obtains the microstructure that crystal grain is tiny, even grain size distributes.At last, through smooth processing, obtain the higher SPCC steel sheet of no remarkable yield platform and yield tensile ratio.Compare with background technology, the SPCC steel sheet of present method preparation has the yield tensile ratio index of obvious raising.
The thick hot rolling SPHC of employed 2.5--3.0mm steel plate is all available from Hebei steel enterprise Tangshan Iron and Steel Co Stainless Steel Branch among the following embodiment; The Straight pull reversable cold-rolling machine is manufactured and designed by Shenyang Northeastern University; Continuous annealing furnace is by Shenyang Northeastern University rolling technique and tandem rolling automatization National Key Laboratory design-build; Bell-type annealing converges the chamber type electric resistance furnace that many electric furnaces company limited produces to carry out in Shanghai; Mechanical property is carried out at the Z330 type drawing machine that Zwick company produces.
Embodiment 1: the thick hot rolling SPHC of 2.5mm steel plate is dropped into the Straight pull reversable cold-rolling machine carry out the once cold rolling processing, being rolled into thickness is the 2.0mm steel plate, inserts 650
oHeat-treat in the C bell type annealing furnace, soaking time is 5min; Afterwards, the recycling cold-rolling mill carries out secondary cold-rolling to be processed, and finally is rolled into the steel sheet that thickness is 0.2mm, and the secondary cold-rolling draft reaches 90%.And then, the steel sheet of secondary cold-rolling is sent into continuous annealing furnace and carry out recrystallize thermal treatment.Steel sheet is with 10
oThe temperature rise rate of C/s is heated to 580
oC, and with stove insulation 80s, again with 15
oThe rate of cooling of C/s is cooled to 550
oC.Afterwards, process by follow-up slow cooling section, be cooled to room temperature.At last, the steel sheet after the continuous annealing is through the smooth processing of permanent unit elongation, and smooth unit elongation is 0.5%.
The SPCC steel sheet metallographic structure photo that embodiment 1 prepares is seen accompanying drawing 1, and the grain size distribution situation is seen accompanying drawing 4, and the mechanical stretch curve is seen (a) in the accompanying drawing 7.The SPCC steel sheet average grain size of preparation is 5.0 μ m, and its yield tensile ratio reaches 0.98.
Embodiment 2: the thick hot rolling SPHC of 3.0mm steel plate is dropped into the Straight pull reversable cold-rolling machine carry out the once cold rolling processing, being rolled into thickness is the 1.3mm steel plate, inserts 625
oHeat-treat in the C bell type annealing furnace, soaking time is 15min; Afterwards, the recycling cold-rolling mill carries out secondary cold-rolling to be processed, and finally is rolled into the steel sheet that thickness is 0.18mm, and the secondary cold-rolling draft reaches 86%.And then, the steel sheet of secondary cold-rolling is sent into continuous annealing furnace and carry out recrystallize thermal treatment.The SPCC steel sheet is with 12
oThe temperature rise rate of C/s is heated to 600
oC, and with stove insulation 50s, again with 28
oThe rate of cooling of C/s is cooled to 525
oC.Afterwards, process by follow-up slow cooling section, be cooled to room temperature.At last, the steel sheet after the continuous annealing is through the smooth processing of permanent unit elongation, and smooth unit elongation is 1.0%.
The SPCC steel sheet metallographic structure photo that embodiment 2 prepares is seen accompanying drawing 2, and the grain size distribution situation is seen accompanying drawing 5, and the mechanical stretch curve is seen (b) in the accompanying drawing 7.The SPCC steel sheet average grain size of preparation is 5.9 μ m, and its yield tensile ratio reaches 0.96.
Embodiment 3: the thick hot rolling SPHC of 2.8mm steel plate is dropped into the Straight pull reversable cold-rolling machine carry out the once cold rolling processing, being rolled into thickness is the 0.6mm steel plate, inserts 600
oHeat-treat in the C bell type annealing furnace, soaking time is 30min; Afterwards, the recycling cold-rolling mill carries out secondary cold-rolling to be processed, and finally is rolled into the steel sheet that thickness is 0.15mm, and the secondary cold-rolling draft reaches 75%.And then, the steel sheet of secondary cold-rolling is sent into continuous annealing furnace and carry out recrystallize thermal treatment.The SPCC steel sheet is with 15
oThe temperature rise rate of C/s is heated to 620
oC, and with stove insulation 30s, again with 40
oThe rate of cooling of C/s is cooled to 500
oC.Afterwards, process by follow-up slow cooling section, be cooled to room temperature.At last, the steel sheet after the continuous annealing is through the smooth processing of permanent unit elongation, and smooth unit elongation is 1.5%.
The SPCC steel sheet metallographic structure photo that embodiment 3 prepares is seen accompanying drawing 3, and the grain size distribution situation is seen accompanying drawing 6, and the mechanical stretch curve is seen (c) in the accompanying drawing 7.The SPCC steel sheet average grain size of preparation is 6.8 μ m, and its yield tensile ratio reaches 0.94.
Claims (2)
1. the cold rolling and continuous annealing process method of a high-yield-ratio SPCC steel sheet is characterized in that comprising following steps:
1. with the SPHC hot-rolled coil, be rolled into the steel plate that thickness is 0.6 ~ 2.0mm at the Straight pull reversable cold-rolling machine, carry out anneal by bell type annealing furnace, thermal treatment temp is 600 ~ 650
oC, heat treatment time are 5 ~ 30min; Steel plate after the anneal carries out secondary cold-rolling, and the reduced thickness to 0.15 of steel plate ~ 0.2mm is called steel sheet, and cold rolling draft is 75 ~ 90%;
2. steel sheet is sent into continuous annealing furnace, carry out continuous annealing and process; In the heating zone of continuous annealing furnace, steel sheet is heated to 580 ~ 620 by room temperature
oC, temperature rise rate maintains 10 ~ 15
oC/s; Then, steel sheet enters the soaking zone of continuous annealing furnace and does the insulation processing, and soaking time is 30 ~ 80s; After leaving soaking zone, enter the cooling section of continuous annealing furnace with steel, the nitrogen that carries by continuous annealing furnace-hydrogen combination cooling atmosphere makes steel plate be quickly cooled to 500 ~ 550
oC, rate of cooling maintains 15 ~ 40
oC/s;
3. the steel sheet after continuous annealing being processed carries out the smooth processing of permanent unit elongation mode; Smooth unit elongation is 0.5 ~ 1.5%, and through smooth processing, final SPCC steel-sheet average grain size is distributed in 5.0 ~ 6.8 μ m scopes, and yield tensile ratio maintains between 0.94 ~ 0.98.
2. the cold rolling and continuous annealing process method of a kind of high-yield-ratio SPCC steel sheet according to claim 1, the thickness that it is characterized in that the SPHC hot-rolled coil is 2.5--3.0mm, be rolled into the steel plate that thickness is 0.6 ~ 2.0mm at the Straight pull reversable cold-rolling machine, carry out anneal by bell type annealing furnace, thermal treatment temp is 600 ~ 650
oC, heat treatment time are 5 ~ 30min; Steel plate after the anneal carries out secondary cold-rolling, the reduced thickness to 0.15 of steel plate ~ 0.2mm.
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| CN104028554A (en) * | 2014-03-07 | 2014-09-10 | 首钢总公司 | Production method of continuously-annealed zinc-coated cold-rolled steel coil |
| CN104087735A (en) * | 2014-07-15 | 2014-10-08 | 唐山渤海钢铁有限公司 | Annealing process for hot rolled steel plate produced by thin slab casting and rolling technology |
| CN104372150A (en) * | 2014-07-02 | 2015-02-25 | 宝钢集团新疆八一钢铁有限公司 | Cold-rolling production technology for SPCC-M steel for door plates |
| CN104762450A (en) * | 2015-03-13 | 2015-07-08 | 内蒙古包钢钢联股份有限公司 | Annealing process of producing SPCC continuous-annealing board with silicon steel annealing furnace |
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| CN114107623A (en) * | 2021-12-01 | 2022-03-01 | 安徽工业大学 | Heat treatment method for reducing aging property of SPHC hot rolled plate coil through online isothermal de-aging annealing |
| CN114645132A (en) * | 2020-07-14 | 2022-06-21 | 柳州钢铁股份有限公司 | Continuous annealing SPCC steel belt with performance close to that of cover annealing product |
| CN114807529A (en) * | 2022-05-06 | 2022-07-29 | 天津市新天钢冷轧薄板有限公司 | Process for reducing risk of producing SPCC (SpcC (spray cooled continuous casting) material by continuous annealing furnace |
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